期刊
JOURNAL OF ENVIRONMENTAL SCIENCES
卷 23, 期 7, 页码 1122-1128出版社
SCIENCE PRESS
DOI: 10.1016/S1001-0742(10)60537-2
关键词
polyaluminium ferric silicate chloride; industrial minerals; recycling; coagulant; wastewater
资金
- National Natural Science Foundation of China [20971112]
- Major Public Service Project of Henan Province [101100910300]
- Education Department in Henan Province [2011A610012]
- Science and Technology Program of Zhengzhou City [10PTGG339-4]
The aim of the present work was to produce a polyaluminium ferric silicate chloride (PAFSiC) coagulant from acidic and alkaline wastewater of purifying graphite by roasting, and subsequently to evaluate coagulation efficiency of the reagent by treating surface water from the Yellow River as well as municipal wastewater in comparison with the conventional coagulant polyaluminium chloride (PAC). The PAFSiC coagulant was prepared by co-polymerization. The effects of (Al+Fe)/Si molar ratio, OH/(Al+Fe) molar ratio (i.e., gamma value), coagulant dosage and pH value of test suspension on the coagulation behavior of FAFSiC and the stability of the PAFSiC were also examined. Results showed that PAFSiC performed more efficiently than PAC in removing turbidity, chemical oxygen demand (COD), and total phosphate (TP). The PAFSiC with a gamma value of 2.0 and (Al+Fe)/Si ratio of 5 (PAFSiC 2.0/5) showed excellent coagulation effect for both turbidity and COD, while PAFSiC 1.0/5 was the best for TP. The optimum coagulation pH range of PAFSiC 2.0/5 was 5.0-9.0, slightly wider than that of PAC (6.0-8.0). The process can be easily incorporated into high-purity graphite production plants, thereby reducing wastewater pollution and producing a valuable coagulant.
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